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Stock Option Plan and Restricted Stock Plan - Schedule of Information Concerning Outstanding and Vested Stock Options (Detail)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number Outstanding 1,094,035
Number Vested 422,945
Exercise Price $13.66 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price | $ / shares $ 13.66
Number Outstanding 36,522
Number Vested 36,522
Remaining Contracted Life (Years) 1 month 6 days
Exercise Price $16.78 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price | $ / shares $ 16.78
Number Outstanding 123,473
Number Vested 123,473
Remaining Contracted Life (Years) 2 years 4 months 24 days
Exercise Price $15.73 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price | $ / shares $ 15.73
Number Outstanding 180,380
Number Vested 136,460
Remaining Contracted Life (Years) 4 years 9 months 18 days
Exercise Price $30.85 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price | $ / shares $ 30.85
Number Outstanding 320,410
Number Vested 126,490
Remaining Contracted Life (Years) 6 years 9 months 18 days
Exercise Price $33.89 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price | $ / shares $ 33.89
Number Outstanding 433,250
Remaining Contracted Life (Years) 8 years 9 months 18 days